This library contains functions for evaluating images from a fluid
flow by means of Particle Image Velocimetry (PIV).

PIV is a way to film the wind or liquid flows. It uses a sequence of
at least two images that are recorded with a well controlled
separation time in-between. Tracer particles that are resident in the
fluid may be illuminated by a light source, mostly a laser, that has
been re-shaped into a sheet of light. In this way, the average
displacement and the deformation of the image texture is
obtained. Applying this analyses on small samples of the images on a
(rectangular) grid results into an instantaneous velocity field of
the fluid flow. PIV may also be applied for other purposes, like
deformations and vibrations of solid surfaces.